Features: It is a timer relay module with high precision, stable and reliable performance. Connect for a period of time, and disconnect for a period of time, infinite loop, support memory when power failure. There is a wide time range that you can set, both "on" time and "off" time are adjustable. It is great to control the reciprocating stroke, or repetitive power on and off for equipment and products burn-in test. Widely used on timer operating equipment, machine repetitive test circuit, fish tank intermittent pump, etc. Specifications: Size: 65mm*36mm*18mm Output Capacity: DC 5V~30V, AC220V10A Quiescent Current: 20mA Working Current: 50mA Working Voltage: DC12V（fluctuate between 10V~16V won't be affected） Operating Temperature: -40℃~85℃ Instruction: After power on, the timer will start to countdown. When time is up, relay will work.Time SettingK1 cycle includes 6 steps. Step 1,2,3 are setting "ON" time, step 4,5,6 are setting "OFF" time.1, Press K1, the first digit flashes, press K2 to change the number;2, Press K1, the second digit flashes, press K2 to change the number;3, Press K1, the third digit flashes, press K2 to change the number;4, Press K1, the first digit flashes, press K2 to change the number;5, Press K1, the second digit flashes, press K2 to change the number;6, Press K1, the third digit flashes, press K2 to change the number;Press K1 till display stops flashing, then press K2 to change decimal point in order to select time range.The third decimal point indicates 0 to 999 minutes, the second decimal point indicates 0 to 99.9 seconds. No decimal point indicates 0 to 999 seconds.Long pressing K2 can turn on/off the display. Package Includes: 1 x Timer Relay Module